Interactive planning tool
Geotextile Decision Tool
Explore when separation fabric may be relevant and when drainage or subgrade correction is the priority.
Method and assumptions
The output distinguishes separation/stabilization concepts from drainage filtration. Woven and nonwoven products have different properties; design selection requires project demands and manufacturer data. Fabric cannot create an outlet or dry a saturated site.
Example and limitations
Use measured dimensions and replace defaults with supplier or local information. Density, material names, truck payloads, prices and requirements vary. Round ordering quantities only after confirming how the supplier sells and delivers material.
Sources and related guidance
Methods follow basic volume arithmetic and general unpaved-road principles. Review FHWA maintenance resources, local road-authority requirements and manufacturer data. See our sources methodology, drainage guide and printable project brief.